https://www.waze.com/editor/?env=usa&lo ... 7,76848200
This segment of Yankee Hill is gravel, connecting N-S paved roads. For most destinations, if coming from the South, it's preferable to travel E-W on Saltillo further south. If coming from the North, using any E-W street before Yankee Hill.
The national FC for Nebraska is a bit wonky and is stamped 2007. The state FC isn't much better, stamped 2008. Both have inaccuracies. For example, Yankee Hill does not curve up to meet Hwy2. It goes due east to 91st and terminates. Both Fed and State FC map wrongly, though there's a little "Relocated" on there perhaps hinting at that.
IMHO, more important than matching the FCs directly is routing traffic best for Wazers (which I say as someone who was surprised when Waze first sent me down the section of Yankee Hill between 70th and 84th). As you see on the map, there's only 3 tiny roads that even collect to that segment (and one which can also collect to paved 84th). Combine that with none of it being within city limits, and you have no major incentive to pave it, hence it isn't (though there is a discussion underway to do so in 2017). Since area residents are aware of it being gravel, with near-zero destinations on it other than a few houses and a radio tower, it is avoided, and is very low traffic.
Lincolnites familiar with the southern Lincoln area (and beyond city limits) know to avoid Rokeby as well, as it is unpaved and also has a large break in connectivity. But it currently has the same Waze classification as the paved Saltillo and (mostly) paved Yankee Hill. Rokeby is a downgraded classification in both FCs compared to Saltillo and Yankee Hill.
It seems like we're a bit stuck in that "Minor Hwy" may be a bit overkill for the major N-S and E-W county roads, but that Primary Street is the only next classification down for collectors, and Primary Street is also used for almost every major road inside Lincoln. In near-urban areas, driveways and minor neighborhoods collect to gravel roads, which should collect to the nearest paved, but we don't have a Waze distinction between the two because most "major" roads in Lincoln are "downgraded" from the Wiki's interpretation of FC -> Waze classification. We don't have a classification that distinguishes the arterials (that carry the majority of the intra-city traffic) from the in-neighborhood collectors (that bring people from their personal street out to the arterial). If you look at the State FC there's lots of "yellow" roads as collectors to "purples", but in Waze they're all Primary Street. However, to drivers, we absolutely follow yellow to purple.